Provided is an imaging unit including an imaging section that includes a pixel capable of performing charge accumulation a plurality of times in response to an imaging instruction for generating one frame of image data; a storage section that stores a pixel signal based on output from the pixel; an updating section that updates the pixel signal already stored in the storage section by performing an integration process to integrate the pixel signal output from the pixel as a result of a new charge accumulation and the pixel signal already stored in the storage section; and a control section that controls whether the updating section performs the update, for each of a plurality of pixel groups that each include one or more pixels.